JP2010158140A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor capable of enriching a technique. <P>SOLUTION: The linear motor 1 includes: two main magnets 13; two coils 9; internal auxiliary magnets 15; stator frames 7; and needle frames 11. The internal auxiliary magnets 15 are formed in annular shape, magnetized in the axial direction, and arranged in a coaxial shape to the two main magnets 13 between the two main magnets 13 and so that the magnetic poles of the same kind as the magnetic poles are directed towards the magnetic poles on the two coil 9 sides of the two main magnets 13. The needle frames 11 consist of non-magnetic materials holding the two main magnets 13 and the internal auxiliary magnets 15. The stator frames 7 consist of the non-magnetic materials holding the two coils 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a linear motor.

  A linear motor called a voice coil motor is known. In Patent Document 1, an inner yoke, an annular magnet fixed to the outer peripheral surface of the inner yoke, two coils provided on the outer periphery of the annular magnet, and a cylindrical shape in which two coils are fixed to the inner peripheral surface A voice coil motor having an outer yoke is disclosed. As the annular magnet, there are provided two magnets magnetized in the radial direction so that the directions of the magnetic poles are opposite to each other. Furthermore, in the linear motor of Patent Document 1, a magnet magnetized in the axial direction is provided between the two magnets, and thereby the inner yoke can be made thin.

JP 2003-199312 A

  In linear motors, further weight reduction, suppression of eddy current generation, ease of assembly, and the like are required. Accordingly, it is preferable that a linear motor based on a new principle capable of solving at least one of such problems is provided and the technology of the linear motor is enriched.

  An object of the present invention is to provide a linear motor that can be enriched in technology.

  A linear motor according to a first aspect of the present invention is formed in an annular shape, is magnetized in a radial direction so that the directions of magnetic poles are opposite to each other, and are arranged coaxially and spaced apart from each other. Two coils disposed coaxially and concentrically with the two main magnets, and formed in an annular shape, magnetized in the axial direction, between the two main magnets An inner auxiliary magnet arranged coaxially with the two main magnets so that the same type of magnetic poles as the magnetic poles of the two main magnets are directed to the two coil sides, and the two main magnets A non-magnetic magnet side frame that holds the magnet and the inner auxiliary magnet, and a non-magnetic coil side frame that holds the two coils; Having.

  Preferably, the linear motor is formed in an annular shape, is magnetized in the axial direction, and is coaxial with the two main magnets on both sides of the two main magnets, and the magnetic poles on the coil side of the adjacent main magnets. On the other hand, it further has two outer auxiliary magnets arranged so as to direct the same kind of magnetic pole as the magnetic pole.

  Preferably, the inner auxiliary magnet is formed in a size extending between the two main magnets.

  Preferably, two inner auxiliary magnets are provided coaxially apart from each other, and a magnetic material is provided between the two inner auxiliary magnets.

  Preferably, two inner auxiliary magnets are provided coaxially apart from each other, and a magnetic body is provided between the two inner auxiliary magnets. The two outer auxiliary magnets have the same shape.

  Preferably, the length of the inner auxiliary magnet from the magnetic pole adjacent to one of the main magnets to the magnetic pole adjacent to the other main magnet is greater than the axial length of each of the main magnets.

  Preferably, the coil side frame is a conductive cylindrical member formed concentrically with the two coils, and the two coils are fixed to an inner peripheral surface or an outer peripheral surface, and are attached to the coil side frame. Is formed with a slit penetrating from the inner peripheral surface to the outer peripheral surface.

  Preferably, the two coils are configured such that a flat wire is wound so that one flat surface of the flat wire is directed to the inner peripheral surface or the outer peripheral surface of the coil-side frame.

  The linear motor of the second aspect of the present invention includes two main magnets arranged in the drive direction so that the magnetization direction is orthogonal to the drive direction and the directions of the magnetic poles are opposite to each other, Two conductors arranged in the driving direction so as to face the two main magnets in the magnetization direction, and capable of flowing currents in directions opposite to each other in the direction perpendicular to the driving direction and the magnetization direction; Between the two main magnets, the magnetizing direction is arranged along the driving direction, and the same kind of magnetic pole as the magnetic pole is directed to the magnetic poles on the two conductor sides of the two main magnets. An inner auxiliary magnet; and a non-magnetic fixing member that fixes the two main magnets and the inner auxiliary magnet.

  The linear motor according to a third aspect of the present invention includes two main magnets arranged in the drive direction so that the magnetization direction is orthogonal to the drive direction and the directions of the magnetic poles are opposite to each other, Two conductors arranged in the driving direction so as to face the two main magnets in the magnetization direction, and capable of flowing currents in directions opposite to each other in the direction perpendicular to the driving direction and the magnetization direction; Between the two main magnets, the magnetizing direction is arranged along the driving direction, and the same kind of magnetic pole as the magnetic pole is directed to the magnetic poles on the two conductor sides of the two main magnets. On both sides of the inner auxiliary magnet and the two main magnets, the magnetization direction is along the drive direction and the adjacent main magnets Two outer auxiliary magnets arranged so that the same kind of magnetic poles as the magnetic poles are directed to the magnetic poles on the conductor side, and the two inner auxiliary magnets are provided coaxially apart from each other, A magnetic body is provided between the two inner auxiliary magnets, and the two inner auxiliary magnets and the two outer auxiliary magnets have the same shape.

  According to the present invention, it is possible to enrich the technology of linear motors.

The perspective view which shows the external appearance of the linear motor which concerns on the 1st Embodiment of this invention. The top view of the linear motor of FIG. Sectional drawing in the III-III line of FIG. The perspective view which decomposes | disassembles the linear motor of FIG. 1, and shows a part. The enlarged view of the area | region V of FIG. The figure explaining the operation | movement of the linear motor of FIG. 1 compared with a comparative example. Sectional drawing which shows typically the principal part of the linear motor which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows typically the principal part of the linear motor which concerns on the 3rd Embodiment of this invention. The figure explaining comparing the 1st-3rd embodiment of the present invention. The figure which shows the principal part of the linear motor of the modification of this invention.

DESCRIPTION OF SYMBOLS 1 ... Linear motor, 7 ... Stator frame (coil side frame), 9 ... Coil, 11 ... Movable child frame (magnet side frame), 13 ... Main magnet, 15 ... Inner auxiliary magnet

(First embodiment)
FIG. 1 is an external perspective view of a linear motor 1 according to the first embodiment of the present invention. FIG. 2 is a front view of the linear motor 1 viewed in the direction of the axis CA. FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The linear motor 1 is configured as a voice coil motor that exhibits a driving force in the direction of the axis CA. The linear motor 1 includes a substantially cylindrical stator 3 and a substantially cylindrical movable element 5 disposed inside the stator 3.

  The stator 3 includes a stator frame 7 and two coils 9 (FIG. 3) fixed to the stator frame 7.

  The stator frame 7 is made of a nonmagnetic material. The non-magnetic material may be conductive such as aluminum or non-magnetic stainless steel (SUS304 or the like), or may be non-conductive such as glass epoxy resin. The stator frame 7 is formed in a cylindrical shape with the axis CA as an axis. A concave portion for accommodating the coil 9 is formed on the inner peripheral surface of the stator frame 7. The stator frame 7 is formed with a plurality of slits 4 (FIGS. 1 and 2) penetrating the stator frame 7 in the radial direction and extending in the axis CA direction. For example, the plurality of slits 4 are equally arranged around the axis CA. The number of slits 4 may be set as appropriate.

  The two coils 9 have the same shape. The coil 9 is formed in a substantially circular annular shape around the axis CA. The cross-sectional shape of the coil 9 is, for example, a rectangle as schematically shown in FIG. The outer peripheral surface of the coil 9 is fixed to the inner peripheral surface of the stator frame 7 by a fixing member (adhesive member) such as a resin. Thereby, the two coils 9 are arranged coaxially apart from each other. The distance between the two coils 9 may be set as appropriate. The two coils may not be connected to each other or may be connected to each other. However, the following description will be made assuming that they are connected to each other.

  The mover 5 has a mover frame 11. As shown in FIG. 3, the mover 5 includes two main magnets 13, two inner auxiliary magnets 15, a mover yoke 17, and two outer auxiliary magnets 19 fixed to the mover frame 11. Have.

  The mover frame 11 is made of a nonmagnetic material. The non-magnetic material may be conductive such as aluminum or non-magnetic stainless steel (SUS304 or the like), or may be non-conductive such as glass epoxy resin. The mover frame 11 is formed in a cylindrical shape with the axis CA as an axis. A concave portion for accommodating the main magnet 13 and the like is formed on the outer peripheral surface of the mover frame 11.

  The main magnet 13, the inner auxiliary magnet 15, the mover yoke 17 and the outer auxiliary magnet 19 are all formed in a circular ring with the same diameter and centered on the axis CA, and are arranged coaxially with each other. Yes. The two main magnets 13 have the same shape, for example. The two inner auxiliary magnets 15 have the same shape, for example. The two outer auxiliary magnets 19 have the same shape, for example.

  The size of each main magnet 13 in the axial direction is smaller than the size of each coil 9 in the axial direction. Further, the axial size of each main magnet 13 is larger than the axial size of each of the inner auxiliary magnet 15 and the outer auxiliary magnet 19, for example, about twice the axial size of the inner auxiliary magnet 15 or the like. It is.

  The total axial size of the two inner auxiliary magnets 15 and the mover yoke 17 is larger than the axial size of each main magnet 13, for example, 1.5 of the axial size of each main magnet 13. ~ 3 times. For example, the inner auxiliary magnet 15 and the outer auxiliary magnet 19 have the same shape.

  The two main magnets 13 are magnetized in the radial direction so that the directions of the magnetic poles are opposite to each other. The two main magnets 13 are spaced apart from each other at an appropriate distance according to the distance between the two coils 9 so that the outer peripheral surfaces face the inner peripheral surfaces of the two coils 9.

  The two inner auxiliary magnets 15 are magnetized in the axial direction. The two inner auxiliary magnets 15 are arranged between the two main magnets 13 so that the same type of magnetic poles as the magnetic poles are directed to the magnetic poles on the two coil 9 sides of the two main magnets 13.

  The mover yoke 17 is made of a magnetic material. The magnetic material preferably has a large relative permeability (passes much magnetic flux). The magnetic body is, for example, iron (SS400 or the like).

  The two outer auxiliary magnets 19 are magnetized in the axial direction. The two inner auxiliary magnets 19 are arranged on both sides (outer sides) of the two main magnets 13 so that the same type of magnetic poles as the magnetic poles are directed to the magnetic poles on the coil 9 side of the adjacent main magnets 13.

  FIG. 4 is a perspective view illustrating a part of the members disassembled from the linear motor 1.

  The stator frame 7 includes a plurality of peripheral surface constituting members 21 (only one is shown in FIG. 4, see also FIGS. 1 and 2) constituting the peripheral surface portion of the stator frame 7, and the axis CA direction of the stator frame 7. And two end portion constituting members 23 constituting the end portion.

  The plurality of peripheral surface constituting members 21 have a shape obtained by equally dividing a cylinder into a plurality of portions in the circumferential direction, and have the same shape. The end component member 23 is formed in a circular ring shape. Each of the plurality of peripheral surface constituent members 21 is fixed to the end portion constituent member 23 by a fixing member such as a screw (not shown). The plurality of slits 4 are formed by gaps between the plurality of peripheral surface constituent members 21. Further, the width from the inner peripheral edge to the outer peripheral edge of the end component member 23 is set to be larger than the thickness from the inner peripheral surface to the outer peripheral surface of the plurality of peripheral surface component members 21, and the plurality of peripheral surface component members 21. Is disposed on the outer peripheral side of the end component member 23, so that a recess for accommodating the coil 9 is formed on the inner peripheral surface of the stator frame 7.

  The mover frame 11 has a peripheral surface constituting member 25 that constitutes a peripheral surface portion of the mover frame 11 and two end portion constituting members 27 that constitute ends of the mover frame 11 in the axis CA direction. .

  The peripheral surface constituting member 25 is formed in a cylindrical shape with the axis CA as an axis. The end component member 27 is fixed to the peripheral surface component member 25 by a fixing member such as a screw. The width from the inner peripheral edge of the end component member 27 to the outer peripheral edge is set larger than the thickness from the inner peripheral surface of the peripheral surface component member 25 to the outer peripheral surface, and the outer peripheral edge of the end component member 27 is the peripheral surface. Since the diameter is set to be larger than the outer peripheral surface of the component member 25, a concave portion in which the main magnet 13 and the like are accommodated is formed on the outer peripheral surface of the mover frame 11.

  In the main magnet 13, the inner auxiliary magnet 15, the mover yoke 17, and the outer auxiliary magnet 19, the peripheral surface constituent member 25 is inserted through these openings, and the peripheral surface constituent member 25 and the end portion constituent member 27 are fixed. Thus, the movable element frame 11 is fixed. The main magnet 13 and the like may be fixed to the mover frame 11 by a fixing member such as resin (adhesive).

  FIG. 5 is a schematic cross-sectional view showing a region V of FIG. 3 in an enlarged manner.

  The coil 9 is configured by winding the wire 29 around the axis CA a plurality of times. For example, the wire 29 is formed by coating a conductive material such as copper with a non-conductive material such as resin. Moreover, the cross-sectional shape of the wire 29 is formed in a substantially rectangular shape. That is, the wire 29 is a so-called flat wire. In the cross section of the wire 29, the diameters in the longitudinal direction and the short direction may be set as appropriate.

  The wire 29 is wound such that the rings formed by the wire 29 are arranged in the axial CA direction and the radial direction. That is, the wire 29 is wound in an aligned manner. Moreover, the wire 29 is wound with one flat wire oriented in the same direction (axis CA). Therefore, there is almost no gap between the rings formed by the wire 29. In addition, although the case where the position of the ring | wheel axis | shaft CA direction formed of the wire 29 in FIG. 5 corresponds by the inner side and the outer side is illustrated, the said position may be shifted | deviated by the inner side and the outer side. The number of windings of the wire 29 may be set as appropriate.

  As shown in FIG. 1, the end portion of the wire 29 is drawn out from the slit 4 to the outside of the stator frame 7. When a voltage is applied to the end of the wire 29, power is supplied to the coil 9. The two coils 9 are connected to each other so that current flows in opposite directions.

  FIG. 6 is a diagram for explaining the operation of the linear motor 1 in comparison with a comparative example. Specifically, FIG. 6A to FIG. 6C are diagrams schematically showing an upper portion on the paper surface of FIG. 3 in the linear motor 1 or the linear motor of the comparative example.

  FIG. 6A shows an operation when it is assumed that the inner auxiliary magnet 15 and the outer auxiliary magnet 19 are not provided in the linear motor 1. At the position of the coil 9, a magnetic field is formed by the main magnet 13 so as to face the opposing direction of the main magnet 13 and the coil 9 (the vertical direction in the drawing of FIG. 6A). Accordingly, when a current passing through the coil 9 flows through the coil 9, a force in the left-right direction (axis CA direction) in FIG. 6 is generated according to Fleming's left-hand rule. In the two coils 9, the magnetic flux passes in the opposite direction. On the other hand, reverse currents flow through the two coils 9. Therefore, in the two coils 9, a force in the same direction is generated, and the linear motor generates a thrust.

  FIG. 6B shows the operation when the outer yoke 107 and the inner yoke 111 are provided in the linear motor of FIG. 6A as in the conventional linear motor. Also in this case, as in FIG. 6A, when currents in opposite directions are passed through the two coils 9, thrust in the left-right direction in FIG. 6 is generated in accordance with Fleming's left-hand rule.

  However, the lines of magnetic force emitted from one main magnet 13 enter the other main magnet 13 through the outer yoke 107 or the inner yoke 111. In other words, a magnetic circuit is configured. As a result, the magnetic flux passing through the coil 9 increases and the thrust increases.

  FIG. 6C shows the operation in the linear motor 1. Also in the linear motor 1, as in FIGS. 6A and 6B, currents in opposite directions flow through the two coils 9, so that according to Fleming's left-hand rule, the left and right directions in FIG. The thrust is generated.

  In the linear motor 1, the inner auxiliary magnet 15 and the outer auxiliary magnet 19 are arranged with the same kind of magnetic pole as the magnetic pole facing the coil 9 side of the main magnet 13. Accordingly, the magnetic lines of force of the magnets repel each other on the coil 9 side. As a result, the lines of magnetic force toward the coil 9 increase. And a thrust increases compared with Fig.6 (a).

  Since the axial size of the coil 9 is larger than the axial size of the main magnet 13 (see FIG. 3), the coil 9 and the main magnet 13 overlap as long as they move within the range of the difference. To maintain. That is, the difference between the axial size of the coil 9 and the axial size of the main magnet 13 is a stroke that is expected to prevent the thrust from decreasing.

  According to the above embodiment, the linear motor 1 has the two main magnets 13, the two coils 9, the inner auxiliary magnet 15, the stator frame 7, and the mover frame 11. The two main magnets 13 are formed in an annular shape, are magnetized in the radial direction so that the directions of the magnetic poles are opposite to each other, and are arranged coaxially apart from each other, and are arranged coaxially apart from each other. . The two coils 9 are arranged concentrically with respect to the two main magnets 13. The inner auxiliary magnet 15 is formed in an annular shape, is magnetized in the axial direction, is coaxial with the two main magnets 13 between the two main magnets 13, and the magnetic poles on the two coils 9 side of the two main magnets 13. On the other hand, the magnetic poles of the same kind as the magnetic poles are disposed. The mover frame 11 is a nonmagnetic material that holds the two main magnets 13 and the inner auxiliary magnet 15. The stator frame 7 is a nonmagnetic material that holds the two coils 9.

  Therefore, in the conventional linear motor, the magnetic circuit is configured by the inner yoke and the outer yoke, whereas in the linear motor 1, the main magnet 13 and the coil 9 are formed by the nonmagnetic stator frame 7 and the movable frame 11. And so on, and the magnetic circuit is not configured. However, the inner auxiliary magnet 15 is disposed, and the magnetic force of the main magnet 13 is effectively used for the thrust of the linear motor 1, whereby the thrust of the linear motor 1 is maintained. Further, since the inner yoke and the outer yoke are not used, the following effects can be obtained.

  The degree of freedom in selecting the material of the frame that holds the main magnet 13 and the coil 9 is improved. Since it is not necessary to use iron for the frame, the weight can be reduced. If the frame is made of a non-conductive material such as glass epoxy resin, the generation of eddy current is suppressed. Further, a metal having a high heat transfer property such as aluminum can be selected as the nonmagnetic material constituting the frame to improve the heat dissipation. Since the frame is not attracted by the magnet, assembly is facilitated.

  The linear motor 1 is formed in an annular shape, is magnetized in the axial direction, is coaxial with the two main magnets 13 on both sides of the two main magnets 13, and with respect to the magnetic pole on the coil 9 side of the adjacent main magnet 13. And two outer auxiliary magnets 19 arranged to direct the same kind of magnetic pole as the magnetic pole. Therefore, the effect of directing the magnetic flux of the main magnet 13 toward the coil 9 is further improved, and the thrust is increased.

  Two inner auxiliary magnets 15 are provided coaxially apart from each other, and a mover yoke 17 is provided between the two inner auxiliary magnets 15. Accordingly, the two inner auxiliary magnets 15 function as if one magnet having a size extending between the two main magnets 13 is arranged. That is, the two inner auxiliary magnets 15 can be made small while maintaining the thrust. As a result, the linear motor 1 can be made inexpensive.

  In particular, when the two inner auxiliary magnets 15 and the two outer auxiliary magnets 19 have the same shape, the number of parts is reduced, mass production effects can be achieved, and the linear motor 1 can be easily reduced in cost.

  The length of the inner auxiliary magnet 15 from the magnetic pole adjacent to one main magnet 13 to the magnetic pole adjacent to the other main magnet 13 (in this embodiment, the total length of the two inner auxiliary magnets 15 and the mover yoke 17) ) Is larger than the length between the magnetic poles of each of the two main magnets 13. Therefore, a large thrust can be obtained by sufficiently directing the magnetic fluxes of the two main magnets 13 toward the coil 9 side.

  When the stator frame 7 is formed of a conductor such as aluminum, an eddy current is generated in the stator frame 7 due to the movement of the mover 5 relative to the stator frame 7. However, since the stator frame 7 is provided with the slit 4, the generation of eddy current is suppressed.

  Since the coil 9 is formed by winding a rectangular wire 29 so that one plane of the rectangular wire faces the axis CA, the outer peripheral surface of the coil 9 forms a cylindrical outer peripheral surface. Accordingly, the adhesion between the coil 9 and the stator frame 7 is improved as compared with the case where the coil 9 is configured by a round wire. As a result, the heat transfer rate from the coil 9 to the stator frame 7 is improved, and as a result, heat dissipation is improved. In addition, what comprised the coil 9 by the round wire is also contained in this invention.

  In the above embodiment, the stator frame 7 is an example of the coil side frame of the present invention, the mover frame 11 is an example of the magnet side frame of the present invention, and the mover yoke 17 is the magnetic body of the present invention. The coil 9 is an example of a conductor.

(Second Embodiment)
FIG. 7 is a schematic diagram showing the main part of the second embodiment. FIG. 7 corresponds to FIG.

  In the second embodiment, instead of the two inner auxiliary magnets 15 and the mover yoke 17 of the first embodiment, one inner auxiliary magnet 215 having a size extending between the two main magnets 13 is provided. This is different from the first embodiment.

  The shape of the inner auxiliary magnet 215 is the same as the shapes of the two inner auxiliary magnets 15 and the mover yoke 17 in the first embodiment. Similarly to the inner auxiliary magnet 15, the inner auxiliary magnet 215 is magnetized in the axial direction and is disposed so that the same type of magnetic pole as the magnetic pole is directed to the magnetic pole on the coil 9 side of the main magnet 13.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained. Further, since the inner auxiliary magnet 215 having a size extending between the two main magnets is provided, a large thrust can be obtained by sufficiently directing the magnetic flux of the main magnet 13 to the coil 9.

(Third embodiment)
FIG. 8 is a schematic diagram showing the main part of the third embodiment. FIG. 8 corresponds to FIG. In the third embodiment, the outer auxiliary magnet 19 is omitted from the second embodiment. According to the third embodiment, the same effect as that of the first embodiment can be obtained.

(Comparison of the first to third embodiments)
FIG. 9 is a diagram comparing the first to third embodiments. The horizontal axis indicates the position in the axis CA direction. Specifically, the range Sm is the range of the main magnet 13. The range Si is a range of the two inner auxiliary magnets 15 and the mover yoke 17 or the inner auxiliary magnet 215. The range So is the range of the outer auxiliary magnet 19. The vertical axis indicates the magnetic flux density at the position of the coil 9.

  A solid line L1 indicates a change in magnetic flux density in the first embodiment. A dotted line L2 indicates a change in magnetic flux density in the second embodiment. A broken line L3 indicates a change in magnetic flux density in the third embodiment.

  In any of the first to third embodiments, the magnetic flux density is rapidly increased in the range Sm. In the range Sm, the magnetic flux density of the second embodiment is slightly higher than that of the first embodiment, but the difference is a slight difference (for example, about 1 to 2%).

  In the third embodiment, since the outer auxiliary magnet 19 is not provided, the magnetic flux density on the range So side of the range Sm is lower than that in the first embodiment and the second embodiment. Further, also on the range Si side of the range Sm, the magnetic flux density of the third embodiment is lower than that of the first embodiment and the second embodiment. However, the difference is relatively small (for example, about 10%).

  As described above, in any of the first to third embodiments, it is possible to increase the magnetic flux density at the position of the coil 9 and increase the thrust without using the yoke. Further, by providing the outer auxiliary magnet 19, the magnetic flux density at the position of the coil 9 is improved.

  In the second embodiment, if the magnetic flux of the main magnet 13 is sufficiently directed to the coil 9 to obtain a large thrust, the inner auxiliary magnet 215 needs to be enlarged to some extent. That is, the amount of magnets must be increased. However, the difference in action between the one inner auxiliary magnet 215, the two inner auxiliary magnets 15 and the mover yoke 17 is a slight difference. Therefore, the first embodiment can maintain the same thrust as the second embodiment while suppressing an increase in the magnet amount.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The linear motor of the present invention is not limited to a so-called voice coil motor in which a coil and an annular magnet are arranged concentrically. For example, the magnet is not limited to an annular one, and may be a rectangular parallelepiped. Further, the coil may be arranged so that the opening faces the magnet.

  Fig.10 (a) is a perspective view which shows the principal part of the linear motor 301 which concerns on the modification of this invention. FIG. 10B is a cross-sectional view taken along line Xb-Xb in FIG.

  In the linear motor 301, the two main magnets 313, the inner auxiliary magnet 315, and the outer auxiliary magnet 319 are each formed in a rectangular parallelepiped shape and arranged in the driving direction. In addition, the relative positional relationship in the drive direction of each magnet is the same as that of the embodiment.

  In the linear motor 301, the coil 309 is arranged with the opening directed toward the main magnet 313 and the like. Two parallel portions 309 a (an example of two conductors) of the coil 309 are disposed so as to be orthogonal to the driving direction and the magnetization direction of the main magnet 313, and are opposed to the main magnet 313.

  Also in this modification, a thrust can be obtained in accordance with Fleming's left-hand rule by passing a current through the coil 309. Further, as in the embodiment, the thrust can be increased by increasing the magnetic flux density in the conductor without using the yoke.

  Moreover, when a linear motor is a boil coil motor, a coil, a magnet, a magnet side frame (11), and a coil side frame (7) are not limited to a cylindrical shape. For example, it may be rectangular when viewed in the axial direction. In addition, in this application, an annular word means the shape surrounding a predetermined axis | shaft, and shall not be limited to what is circular seeing in an axial direction. The annular magnet may be configured by arranging a plurality of small magnets around the axis.

  In the boil coil motor, the coil-side frame is not limited to one constituted by a plurality of members divided in the circumferential direction. For example, the coil side frame may be integrally formed in a cylindrical shape.

  The coil side frame and the magnet side frame may be omitted. For example, a plurality of coils (conductors) or a plurality of magnets may be fixed to each other by a non-magnetic fixing member such as a resin adhesive. In the present application, the term “fixing member” includes a frame.

  The relative sizes in the drive direction of the coil (conductor) and the magnet may be set as appropriate. The size of the coil in the driving direction may be smaller than or equal to the size of the main magnet in the driving direction.

  Either the coil (conductor) or the magnet may be a mover or a stator. Moreover, both may be driven with respect to the apparatus provided with a linear motor.

Claims (10)

Two main magnets formed in an annular shape, magnetized in a radial direction so that the directions of the magnetic poles are opposite to each other, and arranged coaxially apart from each other;
Two coils arranged coaxially apart from each other and concentrically arranged with respect to the two main magnets;
Annular, magnetized in the axial direction, coaxially with the two main magnets between the two main magnets, and with respect to the magnetic poles on the two coil sides of the two main magnets An inner auxiliary magnet arranged to direct the same kind of magnetic poles,
A non-magnetic magnet side frame that holds the two main magnets and the inner auxiliary magnet;
A non-magnetic coil side frame holding the two coils;
Linear motor having It is formed in an annular shape, is magnetized in the axial direction, is coaxial with the two main magnets on both sides of the two main magnets, and is of the same kind as the magnetic pole with respect to the magnetic pole on the coil side of the adjacent main magnet The linear motor according to claim 1, further comprising two outer auxiliary magnets arranged to direct the magnetic poles of the linear motor. The linear motor according to claim 1, wherein the inner auxiliary magnet is formed in a size extending between the two main magnets. Two inner auxiliary magnets are provided coaxially apart from each other,
The linear motor according to claim 1, wherein a magnetic body is provided between the two inner auxiliary magnets. Two inner auxiliary magnets are provided coaxially apart from each other,
A magnetic body is provided between the two inner auxiliary magnets,
The linear motor according to claim 2, wherein the two inner auxiliary magnets and the two outer auxiliary magnets have the same shape. The length from the magnetic pole adjacent to the one main magnet to the magnetic pole adjacent to the other main magnet of the inner auxiliary magnet is larger than the axial length of each of the main magnets. A linear motor as set forth in claim 1. The coil side frame is a conductive cylindrical member formed concentrically with the two coils, and the two coils are fixed to an inner peripheral surface or an outer peripheral surface,
The linear motor according to claim 1, wherein a slit penetrating from the inner peripheral surface to the outer peripheral surface is formed in the coil side frame. The linear motor according to claim 7, wherein the two coils are configured such that a flat wire is wound so that one flat surface of the flat wire is directed to an inner peripheral surface or an outer peripheral surface of the coil-side frame. Two main magnets arranged in the drive direction so that the magnetization direction is orthogonal to the drive direction and the directions of the magnetic poles are opposite to each other;
Two conductors arranged in the driving direction so as to face the two main magnets in the magnetization direction, and capable of flowing currents in directions opposite to each other in a direction perpendicular to the driving direction and the magnetization direction; ,
Between the two main magnets, the magnetizing direction is arranged along the driving direction, and the same kind of magnetic pole as the magnetic pole is directed to the magnetic poles on the two conductor sides of the two main magnets. An inner auxiliary magnet,
A non-magnetic fixing member that fixes the two main magnets and the inner auxiliary magnet;
Linear motor having Two main magnets arranged in the drive direction so that the magnetization direction is orthogonal to the drive direction and the directions of the magnetic poles are opposite to each other;
Two conductors arranged in the driving direction so as to face the two main magnets in the magnetization direction and capable of flowing currents in opposite directions to each other in a direction perpendicular to the driving direction and the magnetization direction; ,
Between the two main magnets, the magnetizing direction is arranged along the driving direction, and the same kind of magnetic pole as the magnetic pole is directed to the magnetic poles on the two conductor sides of the two main magnets. An inner auxiliary magnet,
On both sides of the two main magnets, 2 are arranged so that the magnetization direction is along the driving direction, and the same type of magnetic pole as the magnetic pole is directed to the magnetic pole on the conductor side of the adjacent main magnet. Two outer auxiliary magnets,
Have
Two inner auxiliary magnets are provided coaxially apart from each other,
A magnetic body is provided between the two inner auxiliary magnets,
The two inner auxiliary magnets and the two outer auxiliary magnets have the same shape.

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